@nx/next/src/utils/jest-config-util.js

The Next.js plugin for Nx contains executors and generators for managing Next.js applications and libraries within an Nx workspace. It provides: - Scaffolding for creating, building, serving, linting, and testing Next.js applications. - Integration wit

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.updateJestConfig = updateJestConfig;
const devkit_1 = require("@nx/devkit");
function findProjectJestConfig(host, projectRoot) {
    const extensions = ['js', 'ts', 'cts'];
    for (const ext of extensions) {
        const configPath = `${projectRoot}/jest.config.${ext}`;
        if (host.exists(configPath)) {
            return configPath;
        }
    }
    return null;
}
function updateJestConfig(host, options) {
    if (options.unitTestRunner !== 'jest') {
        return;
    }
    const configPath = findProjectJestConfig(host, options.projectRoot);
    if (!configPath)
        return;
    const offset = (0, devkit_1.offsetFromRoot)(options.projectRoot);
    const isCommonJS = configPath.endsWith('.js') || configPath.endsWith('.cts');
    // Easier to override the whole file rather than replace content since the structure has changed with `next/jest.js` being used.
    // The wrapper around createJestConfig disables SWC path alias resolution.
    // Without explicit baseUrl, Next.js resolves aliases from the app root instead
    // of the workspace root, producing wrong paths. The Nx jest resolver handles
    // alias resolution correctly, so we let it take over.
    const newContent = isCommonJS
        ? `const nextJest = require('next/jest.js');

const createJestConfig = nextJest({
  dir: './',
});

const config = {
  displayName: '${options.projectName}',
  preset: '${offset}jest.preset.js',
  transform: {
    '^(?!.*\\\\.(js|jsx|ts|tsx|css|json)$)': '@nx/react/plugins/jest',
  },
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
  coverageDirectory: '${offset}coverage/${options.projectRoot}',
  testEnvironment: 'jsdom',
};

const jestConfig = createJestConfig(config);

module.exports = async () => {
  const resolved = await jestConfig();
  // Disable SWC path alias resolution — handled by Nx jest resolver.
  for (const value of Object.values(resolved.transform)) {
    if (Array.isArray(value) && value[1]?.resolvedBaseUrl) {
      value[1] = { ...value[1], resolvedBaseUrl: undefined };
    }
  }
  return resolved;
};
`
        : `import type { Config } from 'jest';
import nextJest from 'next/jest.js';

const createJestConfig = nextJest({
  dir: './',
});

const config: Config = {
  displayName: '${options.projectName}',
  preset: '${offset}jest.preset.js',
  transform: {
    '^(?!.*\\\\.(js|jsx|ts|tsx|css|json)$)': '@nx/react/plugins/jest',
  },
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx'],
  coverageDirectory: '${offset}coverage/${options.projectRoot}',
  testEnvironment: 'jsdom',
};

const jestConfig = createJestConfig(config);

export default async () => {
  const resolved = await jestConfig();
  // Disable SWC path alias resolution — handled by Nx jest resolver.
  for (const value of Object.values(resolved.transform)) {
    if (Array.isArray(value) && value[1]?.resolvedBaseUrl) {
      value[1] = { ...value[1], resolvedBaseUrl: undefined };
    }
  }
  return resolved;
};
`;
    host.write(configPath, newContent);
}